Valve mechanism.



R. SGHNIUKE.

VALVE MECHANISM. APPLICATION FILED APR.24,191]

Patented Oct. 22, 1912;

2 SHEETSSHBET 1.

- de'r.

UNITED STATES PATENT oeron.

ROBERT scnnioxn, or WILKINSBUR ,PENNSYLVANIA]' VALVE MECHANISM.

Specification of hetters Patent. 1912.

. Application filed April 24, 1911. seri l no. 623,095. a

To all whom it may concern:

Be itv known that I, ROBERT Sons ICKE, residing at Villainsburg, in the county of Allegheny andState of Pennsylvania, a citizen of the United States, have invented or discovered certain new and useful Improvements in Valve Mechanism, of which improvements the following is a specification.

In operating hydraulic cranes, etc., it is desirable if not practically necessary that the inlet and outlet ports be opened-and 'closed and vice 'versa by a single Continuous movement of the valve operating mechanism, And it is also desirable that the valve mechanism should be of.a character that the valve or 'valves'will not be shifted accidentally by the pressureto which they are subjected. Hence it has been the general custom/co employ a cylinder and piston valve mechanismthe piston or connected parts thereof moving across suitably arranged ports 1n the cylins dition is effective for the intended purpose, but is objectionable on account of the d fiiculty of maintaining the-necessary packmg The invention'described herein has for its .object a construction and arrangement of stop valves which can be forced tightly onto their seats and can be simultaneously shifted in opposite directions by a continuous movement of the'operat-ing means.

The invention is hereinafter more fully described and claimed. j

In the accompanying drawings forming a part of this specification Figure 1 is a sectional elevation of my improved valve mechanism the plane ofsection being in the line of flow of the fluid; .Fig. 2 is a sectional elevation on a plane, indicated by the line 11 '11 Fig. l; and Fig. 3 is 'a'sectio alv view illustrating amodified form of the operating means. V

In the practice of my invention the casing 1 is formed with a passage 2 through which the fluid flows in the direction indicated by the arrow and'across said passage is formed a diaphragm 3 'havinganopening therethrough for the passage of fluid. This diaphragm is so shaped and the portionaround The seat 4 is preferably formed by a hard metal bushing as shown. Between the dia-. 'phragm and the discharge end a of the valve struction.

This construction while ingood c011 an exhaust passage 5 is formed'a portion of the wall of such passage being constructed to form a valve seat 6. The valves 7 and 8 are preferably adapted 'to be moved away from their seats by fluid pressure and are shifted toward and onto their seats by stems 9 and 10 which ext-end v through mac-king boxes'll and 12'0f any suitable type or conshould be ofthe balltype-and should be free to move so-that new portions will bear-upon the seats. "Vhen using the balltype-of valve the steirs are provided with heads 13 and 1-1 having narrow seats bearing onthe balls.

In the construction shown in Figs. land 2 thesstems't) and'lO and the valves: 7 and 8 are shifted or their movement controlled by cams 15 and 16 which are secured toshafts 17 and l8 rotatably mounted in side plates IJsecured't'o the casing 1. These'shafts or pins are provided with arms; 20, 21 connected'by' links 22 to the operating lever The cams are similar in construction having the portions from a-t0 b formed on arcs of circlesconcentric with the-axis of rotation of the cams, while the portions from a to, c are eccentric, and are formed on arcs of shorter radii. While the portions a to b are in contact with the stems of the valves, the latter will be held on their seatsfrom which the valves'ar'e forced by fluid.pres-' shifted toward and if the movement is sufli- 'ClEIlb OIltO its seat wh le the other waive is permitted to be forced away from its seat by fluid pressure. A reversal of the direction of rotation .of the cams willg ositively shift; thesecond valve and permit-of the unseating of the first valve. The cams are so arranged on their operatingshafts that a portion of thesurface a to b of one cam will engage and bear upon the stem of its valve for a short time, while a corresponding portion of the other cam will bear upon the SteIlLOf its valve. It results from this arrangement that both valvesw'ill be posi-' tively seated at the same time noiuatter'in which direction the cams'are-operated. As the throw ofthecams for agiven angular movement thereof should be sufiicient to insurethe seating of the-valves provision should bev made-to compensate for wear,

It: isfpreferred that'the valves,

As clearly cap 30 which is secured on the side plates etc., and to adjust the valves whenjnecessary. This can be conveniently done by providing the stems with adjustable heads or hearing blocks 24 and 25. It is preferred 19. A disk is secured to a shaft or pins 32 rotatably' mounted in the side plates and provided with an operating arm 33 which may be connected to a lever 23. The disk is provided With cam, shapedl slots '34 and 35 into which project respectively the pivotal pins 36 and'37 connecting the links of the toggles. The several parts of this construc tion are so combined that 'when'the disk is [turned in one direction the links of one of the toggles will be brought into line with each other and with their; pivotal connections to the adjustable head and the cap 30, While the other toggle is broken permit ting the valve controlled thereby to be unseated by fluid pressure. I

It is characteristic of my improvement that the valves are positively moved to their seats against fluid pressure and that the operating mechanism is so constructed that there is no liability of the valves being unseated by fluid pressure no matter how that these blocks should be cylindrical and should be guided by the bracing Webs 26 great. 'Ihe valves are not only positively shifted to their seats but are positively locked by their operating mechanism in closed positions. 1

I claim herein as my invention: 1. In a valve mechanism the combination of two stop valves arranged to seat against fluid pressure and means for positively shifting'one of the valves to its seat and permitting the reverse movement of theother valve. H

In a valve mechanism the combination of two stop valves arranged to seat against fluid pressure-and means for positively simultaneously cont-rolling both valves but in opposite directions and locking one of said valves in closed position.

8. In a valve mechanisnn the combination of two stop valves arranged to seat agaln'st fiuid pressure, and means adapted whilemoving in one direction to seat one of said valves and a furthermovenient to permit the shifting of the other from ItS' seat while positively holding the first valve on its seat.

4-. In a valve mechanism the combination of two stop valves arranged to seat against fluid pressure, oppositely arranged cams adapted to shift said valves and means for simultaneously rotating said cams in the a same direction.

In testimony whereof, I have hereunto set my hand.-

ROBERT SCHNICKE.

' Witnesses. I

ALICE A. TICILL, THOMAS JOYCE. 

